If the plant does not need the water to grow, it would not breathe in the carbon dioxide and breathe out oxygen. Why do we need a plant without watering to grow? Can someone list the reasons?
I like the felling of watering the plant.

Yes - but there are some vast regions of barren land on the earth where plants can be cultivated but there is a scarcity of water within them. You would have to build big watering pipes to have these plants watered.
So I am sure some big brains must keep working on finding out if it is possible to a plant to have water changed with other substance or what? I don't know. First we would have to read a lot of articles and books about this problem, then go to lab and test it on little samples and finally try our ideas in the open.
Thank you for your attention:)
LM